package com.fuego.creditsystemnews.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.fuego.creditsystemnews.mapper.FollowMapper;
import com.fuego.creditsystemnews.service.IFollowService;
import com.fuego.creditsystemuser.service.IUserService;
import jakarta.annotation.Resource;
import org.example.dto.Result;
import org.example.entity.Follow;
import org.example.entity.User;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class FollowServiceImpl extends ServiceImpl<FollowMapper, Follow> implements IFollowService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Resource
    private IUserService userService;
    @Override
    public Result follow(Long followUserId, Boolean isFollow,Long userId) {
        //1获取登录用户

        String key ="follows:"+userId;
        //1判断到底是关注还是取关
        if(isFollow){
            // 2关注，新增数据
            Follow follow = new Follow();
            follow.setUserId(userId);
            follow.setFollowUserId(followUserId);
            boolean isSuccess =save(follow);
            if(isSuccess){
                //把关注用户的id，放入redis的set集合 asdd userId followUserId
                stringRedisTemplate.opsForSet().add(key,followUserId.toString());
            }
        }else{
            // 3取关，删除delete from tb_follow where user_id=? and follow_user_id =?
            boolean isSuccess = remove(new QueryWrapper<Follow>()
                    .eq("user_id", userId).eq("follow_user_id", followUserId));
            if(isSuccess)
            {
                //把关注用户的id从redis集合中移除
                stringRedisTemplate.opsForSet().remove(key,followUserId.toString());
            }

        }
        return Result.ok();
    }

    @Override
    public Result isFollow(Long followUserId,Long userId) {
        //1获取登录用户

        //2查询是否关注  select * from tb_follow where user_id =? and follow_user_id =?
        Long count = query().eq("user_id", userId).eq("follow_user_id", followUserId).count();
        //3判断
        return Result.ok(count>0);
    }

    @Override
    public Result followCommons(Long id,Long userId) {
        //1获取当前用户

        String key ="follows:"+userId;
        // 2求交集
        String key2="follows:"+id;
        Set<String> intersect=stringRedisTemplate.opsForSet().intersect(key,key2);
        if(intersect==null || intersect.isEmpty())
        {
            //无交集
            return Result.ok(Collections.emptyList());
        }
        //3解析id集合
        List<Long> ids=intersect.stream().map(Long::valueOf).collect(Collectors.toList());
        //4查询用户
        List<User> users = userService.listByIds(ids);
        return Result.ok(users);
    }
}
